linux-kernel - [PATCH v4] reset: mchp: sparx5: Fix for lan966x

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Message-ID: <20250227105502.25125-1-horatiu.vultur@microchip.com>
Date: Thu, 27 Feb 2025 11:55:02 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: <p.zabel@...gutronix.de>, <Steen.Hegelund@...rochip.com>,
	<daniel.machon@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
	<herve.codina@...tlin.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH v4] reset: mchp: sparx5: Fix for lan966x

With the blamed commit it seems that lan966x doesn't seem to boot
anymore when the internal CPU is used.
The reason seems to be the usage of the devm_of_iomap, if we replace
this with devm_ioremap, this seems to fix the issue as we use the same
region also for other devices.

Fixes: 0426a920d6269c ("reset: mchp: sparx5: Map cpu-syscon locally in case of LAN966x")
Reviewed-by: Herve Codina <herve.codina@...tlin.com>
Tested-by: Herve Codina <herve.codina@...tlin.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
v3->v4:
- update commit message to match the actual changes
- add comment explaining why we can't use devm_of_iomap
v2->v3:
- forward error from of_address_to_resource
- use devm_ioremap instead of_iomap
v1->v2:
- make sure to use iounmap when driver is removed
---
 drivers/reset/reset-microchip-sparx5.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/reset/reset-microchip-sparx5.c b/drivers/reset/reset-microchip-sparx5.c
index aa5464be7053b..6d3e75b33260e 100644
--- a/drivers/reset/reset-microchip-sparx5.c
+++ b/drivers/reset/reset-microchip-sparx5.c
@@ -8,6 +8,7 @@
  */
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
@@ -72,14 +73,22 @@ static struct regmap *mchp_lan966x_syscon_to_regmap(struct device *dev,
 						    struct device_node *syscon_np)
 {
 	struct regmap_config regmap_config = mchp_lan966x_syscon_regmap_config;
-	resource_size_t size;
+	struct resource res;
 	void __iomem *base;
+	int err;
+
+	err = of_address_to_resource(syscon_np, 0, &res);
+	if (err)
+		return ERR_PTR(err);
 
-	base = devm_of_iomap(dev, syscon_np, 0, &size);
-	if (IS_ERR(base))
-		return ERR_CAST(base);
+	/* It is not possible to use devm_of_iomap because this resource is
+	 * shared with other drivers.
+	 */
+	base = devm_ioremap(dev, res.start, resource_size(&res));
+	if (!base)
+		return ERR_PTR(-ENOMEM);
 
-	regmap_config.max_register = size - 4;
+	regmap_config.max_register =  resource_size(&res) - 4;
 
 	return devm_regmap_init_mmio(dev, base, &regmap_config);
 }
-- 
2.34.1